It would be a lot more than a few millions of they released the OUT in Bluray or 4k. It’s something most fans want
Most fans, regular ones that make billions, go see the films and that is it.
Considering that they still make huge amounts of money from every re-release of the OT having the OUT on Blu-Ray would be much bigger deal and would bring in a bigger yield based on that alone. Even some of the more casual fans would pick them up because of the novelty of having an important piece of cinematic history in high definition for the first time.
Fans who buy home video release are a small fraction of everyone who goes to see the film. Hardcore fans like us are a tiny minority. Even within the hardcore fans, there is a huge PT generation of fans who couldn’t care less about OOT and actually prefer PT parasites in OT. Then there is a new generation who will grow up with ST and who will not particularly care either.